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i highly doubt you'd get a contam. by 'open' you mean loosening the lids right? that's okay, i do it for the entire incubation cycle (after I have visual confirmation of the mycelium germination). I wouldn't take the lid off to check them or anything though. Do note that I use a layer of dry vermiculite (ala PF tek), so even with loose jar lids, if contams did get in, they'd have a lot of difficulty getting through to the substrate.

However, of a side note, I accidentally 'birthed' a cake once (incubating upside-down with loose lid), and the cake slid out of the jar. I just put it back in quickly and pretended it never happened.... no contams so....